If they were so advanced that they left the ordinary material world behind, then anything is possible. Otherwise, they would probably be like us in the sense that their in-use technologies would span every level from lowest to their own highest. As our tech improves, we continue to use the wheel and shaped stone and conrete, iron, steel, glass, knives, ceramics, etc. We still use things that are pulled out of the ground (like our distant ancestors) while also using the latest AI algos.So, a very wide range of "industrial civilizations" would be expected to leave behind lots of basic natural materials in artificial forms. Their basic natural materials would be about the same as ours because they are found in nature and not very diverse (compared to high tech pharma chemicals or digital algos), so we ought to be finding lots of evidence of pre-human low(ish) tech, even if they were quite high tech.
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